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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2f813e7a5b3b028e47c332935c55852ad3f522aaab56c566017240925dad22' 
  AND token = 'LZxr2FlgGSqRHwOdOxA1BYDM7mf0dOc5Et5Shjl6daU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}